I'm not a teacher, but I have been in your place once. This is what I did:
- Read English books. If your level of English is not very high, you can start with books for children.
- Watch movies and series in English. Without subtitles in your native language. You can also watch a movie in English with English subtitles (many DVD's have that option for deaf people)
- Find someone who speaks English and practice with that person.